Hello I need help solving this mathematical finance question that I cannot figure out, Thank you! An investment of 700 is to be used to make payments of 10 at the end of the first year, 20 at the end of the second year, 30 at the end of the third year and so on for as long as possible. A smaller final payment is paid one year after the last regular payment. The fund earns an annual effective interest rate of 5%. Calculate the amount of the final payment.